barrett



s. R. BARTLETT.

. Trap Door. I No. 62,809. I Patented March, 12, 1867.

SAMUEL R. BARTLETT, or DETROIT, MICHIGAN Letters Patent o. 62,809, dated March 12', 1867.

' IMPROVED TRAB-DOOR.

@Lhrfiactrhuterefrrreh in in than @rttm ffizttent rut nothing wt at it}: same.

TO'ALL WHOM IT MAY CONCERN: 4

Be it known that I, SAMUEL R. BARTLETT, of the city of Detroit, in the county of Wayne, and State ,of Michigan, have invented a new-improvement in Trap-Doors; and I. do hereby declare that the following is a full,

clear, and exact description thereof, which will enable others skilled in the art to make and use the same, reference-being had to the accompanying drawings, forming a part of this specification. I

My invention consists in attaching to trap-doors, hatches, 850., a swinging arm'which shall, by its own gravity, form a stop to the door, as will'hereinafter be described.

Figure 1 represents atrap-d oor open, with my swinging-arm attached. Fig re Z ShQWS the door closed. I Similar letters of reference indicatelike parts v A represents the floor,'B the door, and O the arm. There is nothing peculiar or novel in the door itself or in the manner oi'its attachment to the floor. The novelty consists in the arm G and in the manner of its adjustment. The arm C is hinged to "about the centre of the door, and, if desired, there may be two or 'more arms attached to the same door. To -about the middle of the arm there is a rod, a,-attache d, which rod passes'through the door, and to the inner end o f-which there is attached a step, b. The rod a plays loosely through the-door, and it maybe curved to correspond with a circle described from the hinge of the arm asa centre. When-the e door is raised and thrown back from a vertical position, asseen in the drawing,,the end of the arm will leave the door by its gravity and strike the floor, acting 'as a brace against the door.. The position, of the arm as it strikes the floor will be determined by the length of the nod a and the weight oi the stop b; the rod. and the stop' 6 having a tendency to forcethe end of the arm back into a more bracing position. than it would have if it. stood vertical. When'any special occasionrequir'es itrthe trap-door can be thrown back and on to the floor, as usual.

4 Having thus described my invention',- wha t I claimv as new, and desire to secure by Letters Patent, is

The combination and arrangement of the arm G, the rod a, and thestop-b, WhenQattached-to a trap-door, substantially as herein 'shownand described.

' SAM, 'R. BARTL TT.

Witnesses:

WM. WILEY, JEFFERSON 'WILEY. 

